src/open.cpp

   1 // Copyright (c) 2003 Daniel Wallin and Arvid Norberg
   2
   3 // Permission is hereby granted, free of charge, to any person obtaining a
   4 // copy of this software and associated documentation files (the "Software"),
   5 // to deal in the Software without restriction, including without limitation
   6 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   7 // and/or sell copies of the Software, and to permit persons to whom the
   8 // Software is furnished to do so, subject to the following conditions:
   9
  10 // The above copyright notice and this permission notice shall be included
  11 // in all copies or substantial portions of the Software.
  12
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
  14 // ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
  15 // TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
  16 // PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
  17 // SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
  18 // ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  19 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
  21 // OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 extern "C"
  24 {
  25         #include "lua.h"
  26 }
  27
  28 #define LUABIND_BUILDING
  29
  30 #include <luabind/luabind.hpp>
  31
  32 using namespace luabind::detail;
  33
  34 void luabind::detail::add_operator_to_metatable(lua_State* L, int op_index)
  35 {
  36         lua_pushstring(L, get_operator_name(op_index));
  37         lua_pushnumber(L, op_index);
  38         lua_pushcclosure(L, &class_rep::operator_dispatcher, 1);
  39         lua_settable(L, -3);
  40 }
  41
  42 int luabind::detail::create_cpp_class_metatable(lua_State* L)
  43 {
  44         lua_newtable(L);
  45
  46         // mark the table with our (hopefully) unique tag
  47         // that says that the user data that has this
  48         // metatable is a class_rep
  49         lua_pushstring(L, "__luabind_classrep");
  50         lua_pushboolean(L, 1);
  51         lua_rawset(L, -3);
  52
  53         lua_pushstring(L, "__gc");
  54         lua_pushcclosure(L, &garbage_collector_s<detail::class_rep>::apply, 0);
  55         lua_rawset(L, -3);
  56
  57         lua_pushstring(L, "__call");
  58         lua_pushcclosure(L, &class_rep::constructor_dispatcher, 0);
  59         lua_rawset(L, -3);
  60
  61         lua_pushstring(L, "__index");
  62         lua_pushcclosure(L, &class_rep::static_class_gettable, 0);
  63         lua_rawset(L, -3);
  64
  65         return detail::ref(L);
  66 }
  67
  68 int luabind::detail::create_cpp_instance_metatable(lua_State* L)
  69 {
  70         lua_newtable(L);
  71
  72         // just indicate that this really is a class and not just any user data
  73         lua_pushstring(L, "__luabind_class");
  74         lua_pushboolean(L, 1);
  75         lua_rawset(L, -3);
  76
  77         // __index and __newindex will simply be references to the class_rep
  78         // wich in turn has it's own metamethods for __index and __newindex
  79         lua_pushstring(L, "__index");
  80         lua_pushcclosure(L, &class_rep::gettable_dispatcher, 0);
  81         lua_rawset(L, -3);
  82
  83         lua_pushstring(L, "__newindex");
  84         lua_pushcclosure(L, &class_rep::settable_dispatcher, 0);
  85         lua_rawset(L, -3);
  86
  87         lua_pushstring(L, "__gc");
  88         //lua_pushcclosure(L, &garbage_collector_s<detail::object_rep>::apply, 0);
  89         lua_pushcclosure(L, detail::object_rep::garbage_collector, 0);
  90         lua_rawset(L, -3);
  91
  92         lua_pushstring(L, "__gettable");
  93         lua_pushcclosure(L, &class_rep::static_class_gettable, 0);
  94         lua_rawset(L, -3);
  95
  96         for (int i = 0; i < number_of_operators; ++i) add_operator_to_metatable(L, i);
  97
  98         // store a reference to the instance-metatable in our class_rep
  99         assert((lua_type(L, -1) == LUA_TTABLE) && "internal error, please report");
 100
 101         return detail::ref(L);
 102 }
 103
 104 int luabind::detail::create_lua_class_metatable(lua_State* L)
 105 {
 106         lua_newtable(L);
 107
 108         lua_pushstring(L, "__luabind_classrep");
 109         lua_pushboolean(L, 1);
 110         lua_rawset(L, -3);
 111
 112         lua_pushstring(L, "__gc");
 113         lua_pushcclosure(L, &detail::garbage_collector_s<detail::class_rep>::apply, 0);
 114         lua_rawset(L, -3);
 115
 116         lua_pushstring(L, "__newindex");
 117         lua_pushcclosure(L, &class_rep::lua_settable_dispatcher, 0);
 118         lua_rawset(L, -3);
 119
 120         lua_pushstring(L, "__call");
 121         lua_pushcclosure(L, &class_rep::construct_lua_class_callback, 0);
 122         lua_rawset(L, -3);
 123
 124         lua_pushstring(L, "__index");
 125         lua_pushcclosure(L, &class_rep::static_class_gettable, 0);
 126         lua_rawset(L, -3);
 127
 128         return detail::ref(L);
 129 }
 130
 131 int luabind::detail::create_lua_instance_metatable(lua_State* L)
 132 {
 133         lua_newtable(L);
 134
 135         // just indicate that this really is a class and not just any user data
 136         lua_pushstring(L, "__luabind_class");
 137         lua_pushboolean(L, 1);
 138         lua_rawset(L, -3);
 139
 140         lua_pushstring(L, "__index");
 141         lua_pushcclosure(L, &class_rep::lua_class_gettable, 0);
 142         lua_rawset(L, -3);
 143
 144         lua_pushstring(L, "__newindex");
 145         lua_pushcclosure(L, &class_rep::lua_class_settable, 0);
 146         lua_rawset(L, -3);
 147
 148         lua_pushstring(L, "__gc");
 149         //lua_pushcclosure(L, detail::garbage_collector_s<detail::object_rep>::apply, 0);
 150         lua_pushcclosure(L, detail::object_rep::garbage_collector, 0);
 151         lua_rawset(L, -3);
 152
 153         for (int i = 0; i < number_of_operators; ++i) add_operator_to_metatable(L, i);
 154
 155         // store a reference to the instance-metatable in our class_rep
 156         return detail::ref(L);
 157 }
 158
 159 void luabind::open(lua_State* L)
 160 {
 161         // get the global class registry, or create one if it doesn't exist
 162         // (it's global within a lua state)
 163         detail::class_registry* r = 0;
 164
 165         // If you hit this assert it's because you have called luabind::open() twice on
 166         // the same lua_State.
 167         assert((detail::class_registry::get_registry(L) == 0) && "you cannot call luabind::open() twice");
 168
 169         lua_pushstring(L, "__luabind_classes");
 170         r = static_cast<detail::class_registry*>(lua_newuserdata(L, sizeof(detail::class_registry)));
 171
 172         // set gc metatable
 173         lua_newtable(L);
 174         lua_pushstring(L, "__gc");
 175         lua_pushcclosure(L, detail::garbage_collector_s<detail::class_registry>::apply, 0);
 176         lua_settable(L, -3);
 177         lua_setmetatable(L, -2);
 178
 179         new(r) detail::class_registry(L);
 180         lua_settable(L, LUA_REGISTRYINDEX);
 181
 182         // add functions (class, cast etc...)
 183         lua_pushstring(L, "class");
 184         lua_pushcclosure(L, detail::create_class::stage1, 0);
 185         lua_settable(L, LUA_GLOBALSINDEX);
 186 }
 187